technische universität dortmund service computing service computing prof. dr. ramin yahyapour it...

technische universität dortmund

Service Computing Prof. Dr. Ramin Yahyapour

IT & Medien Centrum22. Oktober 2009


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HTTP ResponseHTTP/1.0 200 OKDate: Fri, 31 Dec 2008 23:59:59 GMTContent-Type: text/htmlContent-Length: 1354

<html><body><h1>Welcome to my new Homepage!</h1>(more file contents) . . .</body></html>


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Sending Message via SMTP

Connecting to mailhost via ether...Trying 140.252.1.54... connected220 noao.edu Sendmail 4.1/SAG-Noao.G89 ready at Mon, 19 Jul 2008 12:47:34

MST >>> HELO sun.tuc.noao.edu250 noao.edu Hello sun.tuc.noao.edu., pleased to meet you >>> MAIL From:<[email protected]>250 <[email protected]>... Sender ok >>> RCPT To:<[email protected]>250 <[email protected]>... Recipient ok >>> DATA354 Enter mail, end with “.” on a line by itself >>> .250 Mail accepted >>> QUIT221 noao.edu delivering mail


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XML Example<?xml version="1.0"?><booklist> <book available="yes"> <title> Java and XML </title> <author> Brett McLaughlin </author> <isbn> 3-89721-280-3 </isbn> </book> <book available="yes"> <title> Java 2 Micro Edition </title> <author> Eric Giguere </author> <isbn> 0-471-39065-8 </isbn> </book> <book available="no"> <title> Core Jini </title> <author> W. Keith Edwards </author> <isbn> 3-8272-9592-0 </isbn> </book></booklist>


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SAX Parser (1)Import SAX Classes

import org.xml.sax.Attributes;import org.xml.sax.ContentHandler;import org.xml.sax.Locator;import org.xml.sax.SAXException;import org.xml.sax.XMLReader;import org.apache.xerces.parsers.SAXParser;

…


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SAX Parser (2)Install Parser and Input Stream

public class MySAXParser {public void parseFile(String uri) {}

public static void main(String[] args) { MySAXParser mySAX = new MySAXParser(); mySAX.parseFile("booklist.xml"); }}


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SAX Parser (3)Install ContentHandler and Exceptions

public void parseFile(String uri) {XMLReader parser = new SAXParser();

// Create an instance of MyContentHandler ContentHandler myHandler = new MyContentHandler(); parser.setContentHandler(myHandler);

try { parser.parse(uri); } catch (IOException e) { System.out.println("Error reading file: " +

e.getMessage()); System.exit(1); } catch (SAXException e) { System.out.println("Error parsing file: " +

e.getMessage()); System.exit(1); } System.out.println("File parsed successfully!"); }


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SAX Parser (4)ContentHandler

class MyContentHandler implements ContentHandler { private Locator locator;

public void setDocumentLocator(Locator locator) {…}

public void startDocument() throws SAXException {…}

public void endDocument() throws SAXException {…}

public void startPrefixMapping(String prefix, String uri){…}

public void endPrefixMapping(String prefix) throws SAXException {…}

…}


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SAX Parser (5) ContentHandler

class MyContentHandler implements ContentHandler {

public void startElement( String namespaceURI, String localName, String qName, Attributes atts) throws SAXException {…}

public void endElement( String namespaceURI, String localName, String qName) throws SAXException {…}

…}


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SAX Parser (6) ContentHandler

class MyContentHandler implements ContentHandler {

public void characters(char[] ch, int start, int length){…}

public void ignorableWhitespace(char[] ch, int start, int length)

throws SAXException {…}

public void processingInstruction(String target, String data)

throws SAXException {…}

public void skippedEntity(String name) throws SAXException {…}

}


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ValidationExample DTD<!ELEMENT Book ( Title,

Author,ISBN)>

<!ATTLIST Book available CDATA #REQUIRED>

<!ELEMENT Title (#PCDATA)><!ELEMENT Author (#PCDATA)><!ELEMENT ISBN (#PCDATA)>


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ValidationExample XML Schema<?xml version="1.0"?>

<schema targetNamespace="http://www.oreilly.com/catalog/javaxml/">

<element name="Book" type="BookType" />

<complexType name="BookType"> <element name=“Title" type="string" /> <element name=“Author" type=“string" /> <element name=“ISBN" type="string" />

<attribute name=“available" default=“yes"> <simpleType base="string"></simpleType>

</attribute>

</complexType></schema>


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XML Document Tree

Book

Title PriceAuthor ISBNContent

Chapter

XHTML

HEAD BODY

Title Chapter

Transforming Document Trees


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Transformations with XSL

<?xml version="1.0"?>

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"

>

…Rules…

</xsl:stylesheet>


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Transformations with XSLRules<?xml version="1.0"?>


>

<xsl:template match=“Book">…Action…

</xsl:template>

</xsl:stylesheet>


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Transformations with XSLExample of Transformation<?xml version="1.0"?>


>

<xsl:template match=“Book"> <html>

<head> <title> <xsl:value-of select="title"/> </title> </head> <body> <xsl:apply-templates select=“*" /> </body> </html> </xsl:template>

</xsl:stylesheet>

XPath-Referencing

XPath-Filtering


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Transformations with XSLIterations<xsl:template match=“Book">

<xsl:for-each select=“Chapter"> <li>

<xsl:value-of select=“ChapterName" /> </li>

</xsl:for-each>

</xsl:template>


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Using DOM

public class DOMParserDemo {

public void performDemo(String uri) { System.out.println("Parsing XML File: " + uri + "\n\n");

// Instantiate your vendor's DOM parser implementation DOMParser parser = new DOMParser();

parser.setFeature("http://xml.org/sax/features/validation", true); parser.parse(uri); Document doc = parser.getDocument();

… do something with DOM …

}}

public static void main(String[] args) {

String uri = args[0];

DOMParserDemo parserDemo = new DOMParserDemo(); parserDemo.performDemo(uri);}}


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Using DOM (2)Example for Accessing DOM Nodes public void printNode(Node node, String indent) { switch (node.getNodeType()) { case Node.DOCUMENT_NODE: System.out.println("<xml version=\"1.0\">\n"); // recurse on each child NodeList nodes = node.getChildNodes(); if (nodes != null) { for (int i=0; i<nodes.getLength(); i++) { printNode(nodes.item(i), ""); } } break;

case Node.ELEMENT_NODE: case Node.TEXT_NODE: case Node.CDATA_SECTION_NODE: case Node.PROCESSING_INSTRUCTION_NODE: case Node.ENTITY_REFERENCE_NODE: case Node.DOCUMENT_TYPE_NODE: }}


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Using DOM (2)Example for Accessing DOM Nodes public void printNode(Node node, String indent) { switch (node.getNodeType()) { case Node.DOCUMENT_NODE: case Node.ELEMENT_NODE: String name = node.getNodeName(); System.out.print(indent + "<" + name); NamedNodeMap attributes = node.getAttributes(); for (int i=0; i<attributes.getLength(); i++) { Node current = attributes.item(i); System.out.print(" " + current.getNodeName() + "=\"" + current.getNodeValue() + "\""); } System.out.println(">");

// recurse on each child NodeList children = node.getChildNodes(); if (children != null) { for (int i=0; i<children.getLength(); i++) { printNode(children.item(i), indent + " "); } }

System.out.println(indent + "</" + name + ">"); break;

case Node.TEXT_NODE: case Node.CDATA_SECTION_NODE: case Node.PROCESSING_INSTRUCTION_NODE: case Node.ENTITY_REFERENCE_NODE: case Node.DOCUMENT_TYPE_NODE: }}

technische universität dortmund service computing service computing prof. dr. ramin yahyapour it...

Documents

public void startdocument

public void enddocument

mail slide

sax parser

xslrules slide

saxparser slide

public void characterschar

new mycontenthandler